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WASHINGTON - President Bush flanked by (L-R) Federal Reserve Chairman Ben Bernanke, U.S. Treasury Secretary Henry Paulson and SEC Chairman Christopher Cox, speaks about a plan by the federal government to try and shore up failing financial markets.

The Bush administration asked Congress on Saturday for the power to buy $700 billion in toxic assets clogging the financial system and threatening the economy as negotiations began on the largest bailout since the Great Depression.

The rescue plan would give Washington broad authority to purchase bad mortgage-related assets from U.S. financial institutions for the next two years. It does not specify which institutions qualify or what, if anything, the government would get in return for the unprecedented infusion.

Democrats are pressing to require that the plan help more strapped borrowers stay in their homes and to condition the bailout on new limits on executive compensation.

Congressional aides and administration officials are working through the weekend to fill in the details of the proposal. The White House hoped for a deal with Congress by the time markets opened Monday; top lawmakers say they would push to enact the plan as early as the coming week.

"We're going to work with Congress to get a bill done quickly," President Bush said at the White House. Without discussing specifics, he said, "This is a big package because it was a big problem."

The proposal is a mere three pages long, but it gives sweeping powers to the government to dispense gigantic sums of taxpayer dollars in a program that would be sheltered from court review.

"It's a rather brief bill with a lot of money," said Sen. Chris Dodd, D-Conn., the Banking Committee chairman. "We understand the importance of the anticipation in the markets, but we also know that what we're doing is going to have consequences for decades to come. There's not a second act to this — we've got to get this right."

Lawmakers digesting the eye-popping cost and searching for specifics voiced concerns that the proposal offers no help for struggling homeowners or safeguards for taxpayers' money.

Neither presidential candidate took a position on the proposal. GOP nominee John McCain said he was awaiting specifics and any changes by Congress.

Democratic rival Barack Obama used the party's weekly radio address to call for help for Main Street as well as Wall Street.

His language reflected a tricky balance that politicians in both parties are trying to strike, just six weeks before Election Day: Back a plan that doles out hundreds of billions to companies that made bad bets and still identify with the plight of middle-class voters.

Besides mortgage help and executive compensation limits, Democrats are considering attaching middle-class assistance to the legislation despite a request from Bush to avoid adding items that could delay action. An expansion of jobless benefits was one possibility.

Bush sidestepped questions about the chances of adding such items, saying that now was not the time for posturing. "I think most leaders would understand we need to get this done quickly, and you know, the cleaner the better," he said about legislation being drafted.

Treasury officials met congressional staff for about two hours on Capitol Hill on Saturday. Discussions centered on how the plan would work, and Democrats proposed adding the executive compensation limits and new foreclosure-prevention measures. Details of those changes were not available Saturday. Bush and Treasury Secretary Henry Paulson conferred by phone for about 20 minutes in the afternoon, gauging how the negotiations were unfolding.

Among the key issues up for negotiation is which financial institutions would be eligible for the help. The proposed legislation doesn't make it clear, leaving open the question of whether hedge funds or pension funds could qualify.